gerber

//
// path to Gerber
//
// Neil Gershenfeld 
// (c) Massachusetts Institute of Technology 2021
// 
// This work may be reproduced, modified, distributed, performed, and 
// displayed for any purpose, but must acknowledge the mods
// project. Copyright is retained and must be preserved. The work is 
// provided as is; no warranty is provided, and users accept all 
// liability.
//
// closure
//
(function(){
//
// module globals
//
var mod = {}
//
// name
//
var name = 'path to Gerber'
//
// initialization
//
var init = function() {
   mod.fill.checked = true
   }
//
// inputs
//
var inputs = {
   imageInfo:{type:'',
      event:function(evt){
         mod.imageInfo = evt.detail
         }},
   path:{type:'',
      event:function(evt){
         mod.path = evt.detail
         }}}
//
// outputs
//
var outputs = {
   Gerber:{type:'',
      event:function(evt){
         mods.output(mod,'Gerber',evt)
         }}}
//
// interface
//
var interface = function(div){
   mod.div = div
   var btn = document.createElement('button')
      btn.style.padding = mods.ui.padding
      btn.style.margin = 1
      btn.appendChild(document.createTextNode('plot'))
      btn.addEventListener('click',function(){
         plot()
         })
      div.appendChild(btn)
   div.appendChild(document.createElement('br'))
   div.appendChild(document.createTextNode('format:'))
   div.appendChild(document.createElement('br'))
   var formats = document.createElement('div');
   formats.style.textAlign = 'left'
   var input = document.createElement('input')
      input.type = 'radio'
      input.name = mod.div.id+'format'
      input.id = mod.div.id+'fill'
      formats.appendChild(input)
   mod.fill = input
   formats.appendChild(document.createTextNode('fill'))
   formats.appendChild(document.createElement('br'))
   var input = document.createElement('input')
      input.type = 'radio'
      input.name = mod.div.id+'format'
      input.id = mod.div.id+'outline'
      input.disabled = true
      formats.appendChild(input)
   mod.outline = input
   formats.appendChild(document.createTextNode('outline'))
   formats.appendChild(document.createElement('br'))
   var input = document.createElement('input')
      input.type = 'radio'
      input.name = mod.div.id+'format'
      input.id = mod.div.id+'outline'
      input.disabled = true
      formats.appendChild(input)
   mod.drill = input
   formats.appendChild(document.createTextNode('drill'))
   div.appendChild(formats)
   }
//
// local functions
//
function format(x) {
   var s = x.toFixed(6)
   s = s.substr(0,s.length-7)+s.substr(-6,6)
   return s
   }
//
function plot() {
   var imgwidth = mod.imageInfo.width/parseFloat(mod.imageInfo.dpi)
   var imgheight = mod.imageInfo.height/parseFloat(mod.imageInfo.dpi)
   //
   str = ''
   str += "%MOIN*%\n" // inch units
   str += "%LPD*%\n" // layer dark
   str += "%FSLAX66Y66*%\n" // format absolute 6.6
   //
   var x,y
   for (var seg = 0; seg < mod.path.length; ++seg) {
      str += "G36*\n"
      x = imgwidth*mod.path[seg][0][0]/(mod.imageInfo.width-1)
      y = imgheight*mod.path[seg][0][1]/(mod.imageInfo.height-1)
      str += 'X'+format(x)+'Y'+format(y)+'D02*\n'
      for (var pt = 1; pt < mod.path[seg].length; ++pt) {
         var x = imgwidth*mod.path[seg][pt][0]/(mod.imageInfo.width-1)
         var y = imgheight*mod.path[seg][pt][1]/(mod.imageInfo.height-1)
         str += 'X'+format(x)+'Y'+format(y)+'D01*\n'
         }
      x = imgwidth*mod.path[seg][0][0]/(mod.imageInfo.width-1)
      y = imgheight*mod.path[seg][0][1]/(mod.imageInfo.height-1)
      str += 'X'+format(x)+'Y'+format(y)+'D01*\n'
      str += "G37*\n"
      }
   str += "M02*\n"
   //
   var obj = {}
   obj.type = 'file'
   obj.name = mod.imageInfo.name+'.gbr'
   //var xml = new XMLSerializer().serializeToString(str)
   //obj.contents = xml
   obj.contents = str
   outputs.Gerber.event(obj)
   }
/*
%ADD11C,0.1*%
%LPC*%
G01*
D11*
X1000Y1000D02*
X1000Y2000D01*
X2000Y2000D01*
X1500Y1000D01*
M02*
*/
//
// return values
//
return ({
   mod:mod,
   name:name,
   init:init,
   inputs:inputs,
   outputs:outputs,
   interface:interface
   })
}())